Bangladeshi police are investigating possible murder charges against the owner of a shoddily built factory that collapsed nearly two weeks ago after the wife of a garment worker crushed in the accident filed a complaint.

The legal development comes as officials said Monday that the death toll from the country's worst industrial disaster had reached 645.

Sheuli Akter, the wife of Jahangir Alam, filed the complaint with Dhaka magistrate Wasim Sheikh, saying her husband and other workers were "pushed toward death" by building owner Mohammed Sohel Rana and two others.

Alam was employed in New Wave Styles Ltd., one of the five garment factories housed in the eight-story Rana Plaza that collapsed April 24 as workers started their morning shift even though cracks had developed in the building.